<template>
  <div>
    <!-- 面包屑 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图-->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <!--表格-->
      <tree-table class="treeTable"
        :data="cateList"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        show-index
        index-text="#"
        border>
        <template slot="isok" slot-scope="scope">
          <i class="el-icon-success" style="color: lightgreen" v-if="scope.row.cat_deleted === false"></i>
          <i class="el-icon-error" style="color: red" v-else></i>
        </template>
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag size="mini" type="success" v-else-if="scope.row.cat_level === 1">二级</el-tag>
          <el-tag size="mini" type="warning" v-else="scope.row.cat_level === 2">三级</el-tag>
        </template>
        <template slot="opt" slot-scope="scope">
          <el-button size="mini" type="primary" icon="el-icon-edit"  @click="showEditDialog(scope.row.id)">编辑</el-button>
          <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeUserById(scope.row.id)">删除</el-button>
        </template>
      </tree-table>
      <!--分页-->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="pageSizes"
        :page-size="queryInfo.pagesize"
        :layout="layout"
        :total="total">
      </el-pagination>
    </el-card>
    <!--添加分类对话框-->
    <el-dialog  title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialogClose">
      <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="80px">
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类" >
          <template>
            <el-cascader
              v-model="selectedkeys"
              :options="parenCateList"
              :props="cascaderProps"
              @change=" parenCateChange" clearable>
            </el-cascader>
          </template>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
          <el-button @click="addCateDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="addCate">确 定</el-button>
        </span>
    </el-dialog>

  </div>
</template>

<script>
  export default {
      data() {
          return {
            cateList: [],
            queryInfo: {
              type: 3, // 查询参数
              pagenum: 1, // 当前页码
              pagesize: 5 //  每页显示条数
            },
            pageSizes: [5, 10, 20],
            layout: 'total, sizes, prev, pager, next, jumper',
            total: 0,
            columns: [
              {
                label: '分类名称',
                prop: 'cat_name'
              },
              {
                label: '是否有效',
                // 表示将当前列定义为模板列
                type: 'template',
                // 表示当前这一列的模板名称
                template: 'isok'
              },
              {
                label: '排序',
                // 表示将当前列定义为模板列
                type: 'template',
                // 表示当前这一列的模板名称
                template: 'order'
              },
              {
                label: '操作',
                // 表示将当前列定义为模板列
                type: 'template',
                // 表示当前这一列的模板名称
                template: 'opt'
              }
            ],
            addCateDialogVisible: false,
            addCateForm: {
              cat_name: '',
              cat_pid: 0,
              cat_level: 0
            },
            // 添加验证规则
            addCateFormRules: {
              cat_name: [
                {required: true, message: '用户名不能为空', trigger: 'blur'}
              ]
            },
            // 父级分类列表
            parenCateList: [],
            cascaderProps: {
              value: 'cat_id',
              label: 'cat_name',
              children: 'children',
              checkStrictly: true
            },
            // 被选中的父级分类
            selectedkeys: []
          }
        },
      created() {
          this.getCateList();
        },
      methods: {
        async getCateList() {
          const {data: res} = await this.$http.get('categories', {
            params: this.queryInfo
          });
          if (res.meta.status !== 200) return this.$message.error('获取商品信息失败');
          this.cateList = res.data.result;
          this.total = res.data.total
        },
        handleSizeChange(newSize) {
          this.queryInfo.pagesize = newSize;
          this.getCateList()
        },
        handleCurrentChange(newPage) {
          this.queryInfo.pagenum = newPage;
          this.getCateList()
        },
        // 添加分类
        showAddCateDialog() {
          this.getParenCateList();
          this.addCateDialogVisible = true;
        },
        // 获取分类数据列表
        async getParenCateList() {
          const {data: res} = await this.$http.get('categories', {
            params: {type: 2}
          });
          if (res.meta.status !== 200) return this.$message.error('获取父级列表失败！');
          console.log(res.data)
          this.parenCateList = res.data
        },
        // 选中父级分类触发函数
        parenCateChange() {
          console.log(this.selectedkeys)
          // 如果selectedkeys 数组长度大于0 说明选中是父级类
          // 反之就没有选中任何父级类
          if (this.selectedkeys.length > 0) {
            // 父类ID
            this.addCateForm.cat_pid = this.selectedkeys[this.selectedkeys.length - 1]
            // 当前分类赋值
            this.addCateForm.cat_level = this.selectedkeys.length
            return
          } else {
            this.addCateForm.cat_pid = 0
            this.addCateForm.cat_level = 0
          }
        },
        addCate() {
          this.$refs.addCateFormRef.validate(async valid => {
            // 判断校验是否通过
            if (!valid) return;
            const {data: res} = await this.$http.post('categories', this.addCateForm);
            if (res.meta.status !== 201) return this.$message.error({message: '更新权限失败！'});
            this.$message.success({message: '更新用户成功！'});
            this.getCateList();
            this.addCateDialogVisible = false;
          })
        },
        // 监听关闭父级对话框
        addCateDialogClose() {
          this.$refs.addCateFormRef.resetFields();
          this.selectedkeys = []
          this.addCateForm.cat_pid = 0
          this.addCateForm.cat_level = 0
        }
      }

    }
</script>

<style lang="less" scoped>
  .treeTable{
    margin-bottom: 15px;
  }
  .el-cascader{
    width: 100%;
  }
</style>
